"But as Geoffrey (Robinson, former Coventry MP) has just said, we don't know what her hand is - she is not telling us what her hand is in these negotiations".
The draft was leaked to newspapers, a sign of the divisions that have deepened in the party under Corbyn, whose backers have driven the move leftwards against the wishes of many lawmakers. "We've amended a draft document in the most informed, interesting and sensible debate".
But he has now been replaced with the poster to be launched by Labour's election co-ordinators Andrew Gwynne and Ian Lavery.
The Labour leader claimed the policies, including re-nationalising the UK's railways, energy firms and the Royal Mail, would "transform the lives of many people in our society".
Jeremy Corbyn's day is going from bad to disastrous.
The full and amended manifesto will be published over the next few days, Corbyn said.
Concerns were understood to have been raised in the meeting about how various drafts of the manifesto had been leaked to the media, with the leader's office and other senior figures blaming each other for the breach.
May's decision to call an early election for next month caught not only most of her own party by surprise, but has forced Labour and other parties to scramble to devise policies and campaigns nearly overnight.
A 43-page document was circulating on Wednesday night, but senior Labour sources said the draft discussed at the meeting on Thursday was longer. Len McCluskey, general secretary of the Unite union, left before Corbyn and told reporters there had been "complete unanimity".
"Because you don't lose the courage to fight for what you believe in, you don't stand back and say this is now not for me, it's too hard, that you continue to fight and support and champion what really matters to the future of this country".